/*
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Original Code is iSQL-Viewer, A Mutli-Platform Database Tool.
 *
 * The Initial Developer of the Original Code is iSQL-Viewer, A Mutli-Platform Database Tool.
 * Portions created by Mark A. Kobold are Copyright (C) 2000-2007. All Rights Reserved.
 *
 * Contributor(s): 
 *  Mark A. Kobold [mkobold <at> isqlviewer <dot> com].
 *  
 * If you didn't download this code from the following link, you should check
 * if you aren't using an obsolete version: http://www.isqlviewer.com
 */
package org.isqlviewer.swing;

import java.io.File;
import java.text.MessageFormat;

import javax.swing.filechooser.FileFilter;

/**
 * Simple class for creating file filters.
 * <p>
 * This class is used in conjunction with JFileChoosers.
 * 
 * @author Mark A. Kobold &lt;mkobold at isqlviewer dot com&gt;
 * @version 1.0
 * @see javax.swing.JFileChooser#addChoosableFileFilter(javax.swing.filechooser.FileFilter)
 */
public final class ExtensionFileFilter extends FileFilter {

    private String ext = "";
    private String desc = "";

    /**
     * Default constructor.
     * <p>
     * Creates a files using the given extension and description for the type of files this filters.
     * 
     * @param ext is the extenstion to use like &quot;txt&quot;
     * @param Desc Something that describes the file type to the user.
     */
    public ExtensionFileFilter(String ext, String description) {

        if (ext == null) {
            throw new NullPointerException("File Extensions Cannont Be null");
        }

        if (description == null) {
            throw new NullPointerException("File Description Cannont Be null");
        }
        this.ext = new String(ext);
        this.desc = MessageFormat.format("{0} (*.{1})", new Object[]{description, ext});
    }

    public File applyExtension(File original) {

        return new File(original.getParentFile(), original.getName().concat(".".concat(ext)));
    }

    @Override
    public boolean accept(File f) {

        if (f.canRead() || f.canWrite())
            return (f.getName().endsWith("." + ext) || f.isDirectory() || (f.isDirectory() && f.isHidden() && f
                    .getName().startsWith(".")));

        return false;
    }

    @Override
    public String getDescription() {

        return desc;
    }
}